As the reference's TryFrom<CBOR> (error type Error): the index as a usize with dcbor's negative wrap, then General Invalid KeyDerivationMethod for an unknown one; a non-integer or out-of-width head is Cbor (CBOR error: …).
TryFrom<CBOR>
Error
usize
General
Invalid KeyDerivationMethod
Cbor
CBOR error: …
As the reference's
TryFrom<CBOR>(error typeError): the index as ausizewith dcbor's negative wrap, thenGeneralInvalid KeyDerivationMethodfor an unknown one; a non-integer or out-of-width head isCbor(CBOR error: …).